Add "noUncheckedIndexedAccess": true to compilerOptions

[dskloetc]

Description

There was a bug in the iTick EA that could have been caught by the compiler if the compiler had realized that someArray[0] is undefined if the array is empty. But the compiler doesn't do that unless noUncheckedIndexedAccess is enabled.

If we change the generator template, we can make sure this option is enabled by default in future EAs.

Changes

1. Add "noUncheckedIndexedAccess": true to "compilerOptions": { in scripts/generator-adapter/generators/app/templates/tsconfig.json.
2. Update the generated code to satisfy the new compiler check.

Tested

In external-adapters-js:

1. Use these instructions to point packages/scripts/package.json to the local framework repo with the change.
2. Run yarn new and follow the instructions.
3. Create an adapter with name abcd.
4. Inspect the contents of packages/sources/abcd/tsconfig.json.
5. Build the generated adapter.

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🟢 This PR has valid version labels and will cause a patch bump.

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🚀 Successfully created version bump PR: #745